General Amusement:
* Jester: This implies a prisoner who uses humor to entertain or lighten the mood.
* Wag: A mischievous and humorous person, suggesting a playful personality.
* Merry: This implies a cheerful and lighthearted prisoner, potentially even one who makes light of their situation.
More Specific Connotations:
* Droll: This suggests a dry, witty, and humorous personality.
* Facetious: This implies someone who uses humor to be playfully ironic or sarcastic.
* Sardonic: This suggests a cynical and mocking sense of humor, potentially used to cope with a difficult situation.
Other Possibilities:
* Charismatic: This implies a prisoner who has a captivating personality and uses humor as part of their appeal.
* Likeable: This simply means the prisoner is well-liked, possibly due to their humor.
Ultimately, the best word to use depends on the specific context and the type of humor the prisoner uses.